Brake for motor-shafts or elevators.



No. 707,442. Patented Aug. l9, I902.

E. W. MOON.

BRAKE FOR MOTOR SHAFTS OF ELEVATORS. (Application filed Mar. 7. 1902.)

(N0 Model.)

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NTTnn STaTns PATENT FFICE.

EDWARD W. MOON, OF ST. LOUIS, MISSOURI.

BRAKE F0 R MOTOR-S HAFTS OF ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 707,442, dated August19, 1902. Application filed March 7,1902. Serial No. 97,102. (No model.)

To all whom it may concern:

Be it known that I, EDWARD 1N. MOON, a citizen of the United States,residing in the city of St. Louis, in the State of Missouri, haveinvented certain new and useful Improvements in Brakes for Motor-Shaftsof Elevators, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification.

My invention relates to a brake mechanism for controlling the rotationof the shafts of motors used in furnishingpower for the operation ofelevators.

The invention consists in features of novelty hereinafter fullydescribed, and pointed out in the claims.

Figure I is a view in side elevation of my brake. Fig. 11 is an end viewof the brake. Fig. III is a perspective view of two of the opposing cammembers shown separated. Fig. IV is an enlarged detail verticalsectional view of one of the outer cam members and a portion of theengaginginner cam member and the adjustment and jam nuts.

1 designates the shaft of a motor, on which is rigidly mounted abrake-wheel 2.

3 designates friction-brake straps located at the face of the rim of thebrake-wheel 2, so as to be capable of movement to and contact with therim of said wheel. The straps 3 are attached to a pair of hinge-arms 4c,pivotally supported on a stud 5, projecting from a hanger 6. Fixed tothe lower ends of the straps 3 are inner cam members 7, each of which isprovided with a pair of inclined camfaces 8, that lead from and to thelongitudinallfr-extending straight faces 9. (See Fig. III.

10 is a rock-shaft that passes loosely through the inner cam members 7and has positioned upon it between the two cam members an eX- pansiblecoil-spring 11, the energy of which is exerted to hold the inner cammembers outwardly away from each other. The rock-shaft 10 is looselymounted in bearings 12.

13 designates outer cam members provided interiorly with grooves 14 andmounted 011 the rock-shaft 10 in opposition to the inner cam members 7.The cam members 13 are each provided with inclined cam-faces 15, thatlead from and to horizontal straight faces 16, the

faces 15 and 16 being adapted for engagement with the faces 8 and 9 ofthe inner cam membore 7. The cam members 13 are each slidably mounted onthe rock-shaft 10, but are held from rotation thereon by a feather 10,(see Fig. IV,) that is seated in the groove 14: of the cam member, sothat the outer cam members are capable of rotation only with therock-shaft 10. The shaft 10 is provided with threaded portions 10", onwhich are adjustment-nuts 17, held by jam-nuts 18. The adjustmentnuts 17are adapted for movement to and from the outer cam member 13 to carrysaid cam members and also the inner cam members 7 inwardly on therock-shaft toward each other for the purpose of causing the brake-straps3 to occupy a position closer to or more remote from therim of thebrakewheel 2.

19 is a rocker-arm carried by the rock'shaft 10 and to the outer end ofwhich is pivotally connected a throw-bar 20. The throw-bar 20 is pivotedto the drum 21, that receives the shifter-rope 22, by which the movementof an elevator is governed.

In the practical use of the brake when the shifter-rope 22 is moved inthe operation of the elevator driven by the motor to which the brake isapplied the drum 21 is rocked, which causes the throw-bar 20 to bemoved, as indicated by dotted lines, Fig. 11. In such movement of thethrow-bar the rocker-arm 19 is elevated in setting the brake and therockshaft 10 is rotated in its bearings. On the rocking of the shaft 10the outer cam memhere 13 are movedtherewith, causing the inclined faces15 of said cam members to ride in contact with the inclined faces 8 ofthe inner cam members 7 in such manner that the extremities of theinclined faces are brought toward each other and the inner cam membersare forced inwardly toward each other, therebycarrying the brake-straps3 to the rim of the brake-wheel 2 to securethe braking action upon saidbrake-wheel. On the reverse movement of the shifter-rope the rockshaft10 is returned to its normal position, and with it the outer cam members13, and the inner cam members are forced outwardly into their normalposition by the expansible spring 11, located on the rock-shaft betweenthem.

I claim as my invention 1. In a brake of the class described, thecombination With a brake-wheel, of a pair of brake-straps located at therim of said wheel, a rock-shaft, a pair of inner cam members havingconnection with said brake-straps and through which said rock-shaftpasses, and a pair of outer cam members non -rotatably mounted on saidrock-shaft and arranged in engagement with said inner cam members,substantially as described.

2. In a brake of the class described, the combination with abrake-wheel, of a pair of brake-straps located at the rim of said wheel,a rock-shaft, a pair of inner cam members having connection with saidbrake-straps and through which said rock-shaft passes, a pair of outercam members non-rotatably mounted on said rock-shaft and arranged inengagement with said inner cam members, and an expansible spring locatedbetween said inner cam members, substantially as described.

3. In a brake of the class described, the combination with abrake-wheel, of a pair of brake-straps located at the rim of said wheel,a pair of inner cam members having inclined faces and connected to saidbrake-straps, a

spring located between said inner cam members, outer cam members havinginclined faces arranged to engage the inclined faces of said inner cammembers, and a rock-shaft passing loosely through said inner cam membersand having non-rotative connection with said outer cam members,substantially as described.

4. In a brake of the class described, the combination with abrake-wheel, of a pair of brake-straps located at the rim of said wheel,a pair of inner cam members having inclined faces and connected to saidbrake-straps, a spring located between said inner cam members, outer cammembers having inclined faces arranged to engage the inclined faces ofsaid inner cam members, a rock-shaft passing loosely through said innercam members and having non-rotative connection with said outer cammembers, and means on said rockshaft for adjusting said outer cammembers to said inner cam members, substantially as described.

EDWARD W. MOON. In presence of- E. S. KNIGHT, N. V. ALEXANDER.

